| 宁夏盐池长芒草草原和苜蓿人工草地水分利用研究 |
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| 引用本文： | 李凤民,张振万.宁夏盐池长芒草草原和苜蓿人工草地水分利用研究[J].植物生态学报,1991,15(4):319-329. |
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| 作者姓名： | 李凤民 张振万 |
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| 作者单位： | 西北植物研究所，西北植物研究所 陕西杨陵镇 712100 华东师范大学环境科学系，上海，200062，陕西杨陵镇 712100 |
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| 摘 要： | 本文用离体快速称重法对宁夏盐池长芒草天然草地和苜蓿人工草地的水分利用状况进行了比较研究。研究发现：很干旱的苜蓿草地具有较高的生物量，而在水分条件相对较好的长芒草草地中生产力却很低。苜蓿草地的蒸腾耗水量占蒸散量的86.9%，而长芒草草地中只占40.7%。水分利用强度苜蓿草地为137.32%，而长芒草草地为88.72%，而且有迹象表明，苜蓿草地的水分利用深度超过了180cm，而长芒草草地则保持在180cm范围之内。两草地的蒸腾效率在整个生长季中基本一致，而蒸散效率苜蓿草地为0.82‰，长芒草草地为0.54‰。经过一个生长季，苜蓿草地水分亏缺达-101.8mm，而长芒草草地为-17.6mm。
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| 关 键 词： | 草地 水分 长芒草 苜蓿 宁夏盐池 |
THE STUDY ON WATER USE OF THE ALFALFA GRASSLAND AND THE STIPA BUNGEANA GRASSLAND IN NINGXIA YANCHI |
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| Li Feng-min Zhang Zhen-wan.THE STUDY ON WATER USE OF THE ALFALFA GRASSLAND AND THE STIPA BUNGEANA GRASSLAND IN NINGXIA YANCHI[J].Acta Phytoecologica Sinica,1991,15(4):319-329. |
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| Authors: | Li Feng-min Zhang Zhen-wan |
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| Affiliation: | Northwest Institute of Botany |
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| Abstract: | This paper made a comparative study on the water use of the artificial alfalfa grassland and the natural Stipa bungeana grassland with the method of rapid weighing cut leaves or shoots improved by author in Ningxia Yanchi in 1988. The results showed that the productivity in the very arid alfalfa grassland was very high, but that in the Stipa bungeana grassland with a better soil water content it was very low. The ratio of water consumption by transpiration and by evapotranspiration in the alfalfa grassland was 86.0%,but in the Stipa bungeana grassland it was 40.7%.The water use intensity of the alfalfa grassland was 137.32%, but in the Stipa bungeana grassland it was 88.72%. And there were signs to show that the depth of water use in the alfalfa grassland was deeper than 180cm, but in the Stipa bungeana grassland it did not go over 180cm. The transpiration efficiencies in both the grasslands were basically identical, but the evapotranspiration efficiency in the alfalfa grassland was much higher than in the Stipa bungeana grassland (0.82‰ and 0.54‰ respectively) . After the growth phase, the water deficit in the alfalfa grassland reached -101.8mm, but in the Stipa bungeana grassland it was only -17.6mm. |
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| Keywords: | Grassland Water Stipa bungeana Alfalfa Ningxia Yanchi |
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